<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>demo 1111...........</title>
    <style lang="less">
        html,body{
            margin: 0;
            padding:0;
            outline: none;
        }

        html,body{
            height: 100%;
            width: 100%;
        }
        .wrap{
            display: flex;
            flex-direction: column;
            height: 100%;

        }
        header,footer{
            height: 80px;
            background: #666666;
            line-height: 80px;
            text-align: center;
        }
        .content{
            display: flex;
            flex:1;
            overflow: auto;
            align-items: stretch;
        }
        nav,aside{
            background: #eb6f43;
            flex:0 1 200px;
            justify-content: center;
            align-items: center;  
            display: flex;  
        }
        main{
            flex:1 1 auto;
            
        }
        main .h{
            height: 1200px;
            background: pink;
        }

    </style>
</head>
<body>
    <div class="wrap">
        <header>
            head.....
        </header>
        <div class="content">
            <nav>nav .....</nav>
            <main>
                <div class="h">asdasdasdad  main.....</div>
            </main>
            <aside>aside.....</aside>
        </div>
        <footer>
            footer ............
        </footer>
    </div>
</body>
</html>